Permanent-magnet synchronous motor

Abstract

The present invention can achieve a highly efficient permanent-magnet synchronous motor that can obtain output in a high-speed area without prolonging the axis of the permanent-magnet synchronous motor. The present invention provides a highly efficient permanent-magnet synchronous motor that can obtain output in a high-speed area without prolonging the axis of the permanent-magnet synchronous motor, in which stator magnetic poles are formed by dividing a magnetic pole in each phase into a plurality of parts and placing them in a circumferential direction with respect to a rotational axis, at least one divided stator magnetic pole being made movable in the circumferential direction with respect to the rotational axis, and the phase of the movable stator is controlled.

1 . A permanent-magnet synchronous motor having
 a stator in which a magnetic pole having an N pole and an S pole is formed in a circumferential direction with respect to a rotational axis,   a rotor disposed on an inner diameter side of a yoke disposed in a radial direction of the stator, the rotor having permanent magnets placed in the circumferential direction with a slight spacing left between the rotor and the stator, and   coils in a plurality of phases, which are disposed in the stator,   the permanent-magnet synchronous motor being characterized in that:   the magnetic pole is divided into a plurality of magnetic poles; and   a divided magnetic pole is movable in the circumferential direction with respect to the rotational axis.   
     
     
         2 . The permanent-magnet synchronous motor according to  claim 1 , characterized in that the divided magnetic pole of the stator in each phase is disposed so that the divided magnetic pole becomes independent in the circumferential direction. 
     
     
         3 . The permanent-magnet synchronous motor according to  claim 1 , characterized in that the stator is magnetically divided in a direction perpendicular to the circumferential direction. 
     
     
         4 . The permanent-magnet synchronous motor according to  claim 1 , characterized in that the magnetic pole is divided in a direction perpendicular to an axial direction and one divided magnetic pole is movable in the circumferential direction. 
     
     
         5 . The permanent-magnet synchronous motor according to  claim 2 , characterized in that a magnetic pole divided into the direction perpendicular to the circumferential direction is movable in the circumferential direction, and phases of the divided magnetic poles have a Phase difference. 
     
     
         6 . The permanent-magnet synchronous motor according to  claim 1 , characterized in that the divided magnetic pole of the stator in each phase is independently disposed in the axial direction. 
     
     
         7 . The permanent-magnet synchronous motor according to  claim 1 , characterized in that the stator and the rotor have substantially the same magnetic pole pitch. 
     
     
         8 . A permanent-magnet synchronous motor, characterized in that:
 a stator has magnetic poles, which are divided in a direction perpendicular to a circumferential direction, in a plurality of phases;   each of the divided magnetic poles has an arcuate stator iron core that has a plurality of claw magnetic poles extending in an axial direction and also has a coil wound in an elliptical shape; and   a divided magnetic pole is movable along the circumferential direction.   
     
     
         9 . The permanent-magnet synchronous motor according to  claim 8 , characterized in that the divided magnetic pole is divided in a direction perpendicular to a rotational axis, and one of the divided magnetic poles is movable in the circumferential direction. 
     
     
         10 . The permanent-magnet synchronous motor according to  claim 8 , characterized in that:
 the permanent-magnet synchronous motor has a piezoelectric device and linking members that link the magnetic poles, which are divided in a direction perpendicular to the circumferential direction; and   a movable state of the magnetic pole is controlled by using the piezoelectric device according to an operation situation of the permanent-magnet synchronous motor.   
     
     
         11 . A permanent-magnet synchronous motor having
 a stator formed by oppositely disposing a first claw magnetic pole, which includes a radial yoke, a plurality of claws disposed on an inner diameter side of the radial yoke, and an outer circumferential yoke extending on an outer diameter side of the radial yoke, and a second claw magnetic pole, which includes a radial yoke, a plurality of claws disposed on an inner diameter side of the radial yoke, and an outer circumferential yoke extending on an outer diameter side of the radial yoke, and by mutually engaging a first claw and a second claw,   a coil disposed between the first claw and the second claw, and   a rotor that is placed on an inner diameter side of the stator in a circumferential direction with a spacing left,   the magnetic permanent-magnet synchronous motor being characterized in that the stator is movable along the circumferential direction.   
     
     
         12 . The permanent-magnet synchronous motor according to  claim 11 , characterized in that the stator is magnetically divided in a direction perpendicular to the circumferential direction. 
     
     
         13 . The permanent-magnet synchronous motor according to  claim 11 , characterized in that a plurality of stators are stacked along a rotational axis.